摘要
In this paper,ore-forming fluids and ore genesis are discussed based on the analyses of noble gases isotopes of fluid inclusions trapped in pyrite.3He/4He ratios of fluids in the Limu tin-niobium-tantalum deposit are 0.14~0.97 Ra(under 1.0 Ra).These values are smaller than values of mantle fluids and are close to the values of atmosphere saturated water and crust fluids.40Ar/36Ar ratios of fluids are 555.98~855.11 with an average of 705.55,far away from Ar isotopic composition of atmosphere.40Ar*/4He ratios of fluids are 0.08~0.27 with an average of 0.153,close to the values of the crust and lower than the values of crust fluids.20Ne/22Ne ratios are 9.671~9.748,21Ne/22Ne ratios are 0.0306~0.0330,having the characteristics of the atmosphere saturated water.He-Ar isotope composition shows that ore-bearing fluids in the Laohutou,Niulanling and Jinzhuyuan deposits were mainly mixed with the atmosphere saturated water and the crust fluids.The data obtained suggest that the ore-bearing fluids were mainly derived from the atmosphere saturated water and the crust fluids,with some mantle fluids probably involved in the ore-forming process of the Shuiximiao deposit.